1. Introduction
The E-ACE Smart Cigarette Lighter USB TPMS (Tire Pressure Monitoring System) is designed to provide real-time monitoring of your vehicle's tire pressure and temperature. This system enhances driving safety by alerting you to abnormal tire conditions. It features a convenient cigarette lighter plug-and-play design and includes a USB charging port for added utility. This manual covers the installation, operation, and maintenance for both external and built-in sensor versions.

2. Product Features
- Cigarette lighter power supply: Plug and play, no wiring required for the monitor.
- Colorful LCD Digital Display: Clear and easy-to-read tire information.
- Real-time monitoring: Continuously displays pressure and temperature for all four tires.
- Alarm functions: Alerts for low air pressure, high temperature, leakage, and low battery.
- Intelligent Shock Boot: Automatically powers on when the car moves, no manual on/off needed.
- Wireless sensor connection: Easy installation.
- Sensor options: Available with external (K45) or built-in (K45P) sensors to meet diverse needs.
- High-quality chip: Utilizes Freescale and Infineon chips for stable and accurate performance.
- Universal compatibility: Suitable for almost 98% of car models, including SUVs, Sedans, and Vans.
- Integrated USB charging: Includes a USB and Type-C port for digital device charging.


3. Setup and Installation
3.1 Monitor Installation
- Insert the TPMS monitor directly into your vehicle's 12V cigarette lighter socket.
- The monitor will automatically power on when the vehicle starts moving due to its intelligent shock boot feature.
- Adjust the screen angle for optimal visibility and to minimize glare.


3.2 Sensor Installation (External Sensor - K45)
External sensors are designed for easy, user-friendly installation and replacement.
- Unscrew the original valve cap from the tire valve.
- Screw on the anti-theft hexagonal nut onto the valve stem.
- Screw the external sensor onto the valve stem. Ensure the sensor is tightened securely.
- Use the provided wrench to tighten the hexagonal nut against the sensor to prevent theft.
- Check for air leaks by applying soapy water around the valve and sensor.

3.3 Sensor Installation (Built-in Sensor - K45P)
Built-in sensors require professional installation at a car service center due to the need for tire removal and dynamic balancing.
- Remove the original air nozzle from the wheel.
- Install the tire pressure sensor according to the marked position.
- Inflate the tire to the recommended pressure.
- Cover the air vent.
- Perform dynamic balancing machine testing.
- Adjust the counterweight and install the balance block (must be cleaned and dried before pasting).

4. Operating Instructions
4.1 Power On/Off
The monitor automatically powers on when plugged into the cigarette lighter and the vehicle is in motion. It will power off when the vehicle is stationary for an extended period or when removed from the power source.
4.2 Display Information
The LCD screen displays the following information for each tire:
- Tire Pressure (PSI or Bar)
- Tire Temperature (°F or °C)
- Tire Position (LF: Left Front, RF: Right Front, LR: Left Rear, RR: Right Rear)
- System Voltage (12V)
4.3 Alarm Functions
The system will provide visual and audible alerts for the following conditions:
- Low Air Pressure Alarm: When tire pressure falls below the preset threshold.
- High Temperature Alarm: When tire temperature exceeds the preset threshold.
- Leakage Alarm: For rapid air loss.
- Low Battery Alarm: For low sensor battery levels.
4.4 USB Charging Port
The monitor includes a USB output and a Type-C output port for charging digital devices. These ports operate independently of the TPMS monitoring function.

5. Maintenance
5.1 External Sensor Battery Replacement (K45)
The external sensors have replaceable batteries with an estimated life of 2 years.
- Remove the dismantling gasket from the sensor.
- Use the provided wrench to open the sensor shell.
- Carefully remove the old battery.
- Insert a new CR1632 battery, ensuring correct polarity.
- Close the sensor shell and re-install the dismantling gasket.

5.2 Built-in Sensor Battery
The built-in sensors have an estimated battery life of 5 years and are not designed for user replacement. If a built-in sensor battery depletes, the sensor unit will need to be replaced by a professional.
5.3 General Care
- Keep the monitor and sensors clean from dust and debris.
- The sensors are IP67 waterproof and dust-proof, but avoid prolonged submersion.
- Ensure the external sensors are securely tightened to prevent loss or damage.
6. Troubleshooting
If you encounter issues with your TPMS, refer to the following common problems and solutions:
- No display on monitor: Ensure the monitor is securely plugged into the cigarette lighter port and the vehicle's ignition is on.
- No sensor data: Check if sensors are correctly installed. For built-in sensors, professional re-installation might be needed. Ensure the sensors are within range of the monitor.
- Inaccurate readings: Verify tire pressure with a reliable gauge. If discrepancies persist, re-pair the sensors or consult a professional.
- Persistent alarms: Check all tires for actual low pressure, high temperature, or leaks. If no physical issue is found, the sensor might be faulty or require re-calibration.
- External sensor loss: Always ensure the anti-theft hexagonal nut is tightened after installation.

7. Specifications

| Feature | Monitor | External Sensor (K45) | Built-in Sensor (K45P) |
|---|---|---|---|
| Operating Frequency | 433.92MHz | 433.92MHz | 433.92MHz |
| Output Voltage | DC5V | DC5V | DC5V |
| Working Current | 10mA-2A | 10mA-2A | 10mA-2A |
| Output Interface | USB/TYPE-C | USB/TYPE-C | USB/TYPE-C |
| Input Interface | Car cigarette lighter port | Car cigarette lighter port | Car cigarette lighter port |
| Working Temperature | N/A | -20℃ to 80℃ | -40℃ to 125℃ |
| Battery Life | N/A (powered by car) | 2 Years (replaceable) | 5 Years (not replaceable) |
| Protection Rating | N/A | IP67 | IP67 |
8. User Tips
- Regular Checks: Even with a TPMS, it's good practice to visually inspect your tires regularly and manually check pressure with a gauge periodically for cross-verification.
- Optimal Pressure: Always maintain tire pressure according to your vehicle manufacturer's recommendations, typically found on a sticker inside the driver's side door jamb or in your car's owner's manual.
- Sensor Pairing: If a sensor loses connection or provides inconsistent readings, try re-pairing it according to the device's on-screen instructions or by cycling the vehicle's ignition.
- External Sensor Security: For K45 external sensors, always ensure the anti-theft hexagonal nuts are securely tightened after installation to prevent accidental loss or theft.
- Charging: Utilize the integrated USB and Type-C ports to conveniently charge your mobile devices while driving.
9. Warranty and Support
E-ACE products are designed for reliability and performance. For any product-related inquiries, technical support, or warranty claims, please refer to the seller's contact information or the platform's customer service. Keep your purchase receipt as proof of purchase.
- Fast Delivery & Refunds: The product is covered by a fast delivery guarantee, with potential refunds for delays, lost packages, or damaged items.
- Free Returns: Enjoy free returns within 90 days of purchase.